The channel also sneaked a peek at upcoming original miniseries Over the Garden Wall, which premieres this fall. Created by Patrick McHale (creative director, Adventure Time) and based on his short Tome of the Unknown, the series will star Elijah Wood and Collin Dean as Wirt and and Greg, who are trying to find their way out of a mysterious land, aided by an elderly woodsman and a bluebird named Beatrice (Melanie Lynskey).